<template>
  <div class="login_container">
    <div class="login_box">
        <!--头像区-->
        <div class="avatar_box">
            <img src="../assets/logo.png">
        </div>
        <!--登录表单区-->
        <el-form  ref="loginFormRef" label-width="0" class="login_form" :model="loginForm" :rules="loginFormRules">
            <!--用户名-->
            <el-form-item  prop="username">
                <!--element-ui自带的图标-->
                <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
            </el-form-item>
            <!--密码-->
            <el-form-item prop="password">
                <!--iconfont的图标-->
                <el-input type="password" prefix-icon="iconfont icon-3702mima" v-model="loginForm.password"></el-input>
            </el-form-item>
            <!--按钮-->
            <el-form-item class="btns">
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
        </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        //  这两个属性名必须和接口文档中登录要求的字段名一致
        username: 'admin',
        password: '123456'
      },
      // 表单的验证规则对象
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur', regexp: /[\u4e00-\u9fa5]{3,}/ },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  created () {

  },
  methods: {
    // 点击重置石按钮，重置登录表单，重置为初始值
    resetLoginForm () {
      console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    // 为登录按钮绑定单击事件
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        // 通过验证后 发起登录请求  得到响应数据  对象结构并重命名
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 客户端保存服务器端响应的token字符串
        window.sessionStorage.setItem('token', res.data.token)
        // 编程式导航跳转到后台首页home.vue
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height: 100%;
}
.login_box {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    .avatar_box {
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        padding: 10px;
        width: 130px;
        height: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        box-shadow:  0 0 10px #eee;
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}
.btns {
    display: flex;
    justify-content: flex-end;
}
.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
</style>
